Delta ASD-B2-0121-B, User Manual

Page: 34 / 313

Chapter 2 Installation and Storage
Revision June 2010
2-13
Simple Calculation Method
The users can select the adequate regenerative resistors according to the allowable frequency
required by actual operation and the allowable frequency when the servo motor runs without
load. The allowable frequency when the servo motor run without load is the maximum
frequency that can be operated during continuous operation when servo motor accelerate
from 0r/min to rated speed and decelerate from rated speed down to 0r/min. The allowable
frequencies when the servo motor run without load are summarized in the following table.
Allowable Frequencies for Servo Motor Running Without Load (times/min)
When Using Built-in Regenerative Resistor
600W 750W 900W 1.0kW 1.5kW 2.0kW 2.0kW 3.0kW
Motor Capacity
ECMA Series
06 07 09 10 15 20 20 30
ECMA
□□
C - 312 - 137 -
83
(F100)
-
ECMA
□□
E - - - 42 32
24
(F130)
10
(F180)
11
ECMA
□□
G 42 - 31 - - - - -
( ) : motor frame size, unit is in millimeters.
When the servo motor runs with load, the allowable frequency will change according to
the changes of the load inertia and rotation speed. Use the following equation to calculate
the allowable frequency.
Allowable fr equency =
Allowable frequency when serv o motor run without load
m + 1
x
Rated s peed
Operating speed
times
mi n.
2
m = load/motor inertia ratio